I don't think Steemit has years to come, in it's present form. If SMT's are popular, the the stake weighted votes that control the witnesses will allow Zuckerburg, or Eric Schmidt, or some cabal, to simply purchase the accounts holding the mined Steem that controls the witnesses, and the blockchain will be in the hands of the enemy - and those mined stakes will become golden parachutes the Steemit founders drift off into the sunset on.
I am aware of several forks of Steemit in development presently. Furthemore, with retention after one year at ~11%, including botnets and alt accounts, Steemit is facing a crash of users right now.
Steemit doesn't have years.
Edit: only delinking VP from SP protects the witnesses from this Sybil attack, presently as easy for moguls to prosecute as buying a soda.